Tornadoes are most likely to be produced from which type of cloud?

Usually, cumulonimbus clouds are associated with weather that is —

These type of clouds are smooth, gray clouds that cover the whole sky, and block out sunlight. Light rain and drizzle are usually associated with these clouds.

These types of clouds look feathery. They are associated with fair weather. They often indicate that rain or snow will fall within several hours.

These types of clouds are fluffy and white with flat bottoms. They usually indicate fair weather.

These types of clouds get larger and darker on the bottoms. They tend to accumulate on top of each other. They can have and anvil shaped cloud on top. They may produce thunderstorms.